Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3d611883e13b4e2…

MALICIOUS

PDF

70.0 KB Created: 2021-10-01 16:55:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 6d7e2b6665b4f2b642c75d4b90b0921b SHA-1: c5028e50b21c00510560cd0f77009172eb2f072f SHA-256: f3d611883e13b4e290709ff9089ffad808e2aece9a9c58fdae5ffd03f7c3ce5e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised websites and potentially disposable hosting. The embedded URLs, such as 'https://nomylo.ru/uplcv?utm_term=redmi+note+8+pro+custom+rom+download', suggest a lure for phishing or malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://nomylo.ru/uplcv?utm_term=redmi+note+8+pro+custom+rom+download PDF link annotation
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b196bc3e5b---3946580744.pdfIn PDF document text
    • https://funcarele.com/ckfinder/userfiles/files/7716761464.pdfIn PDF document text
    • http://autoservizimensi.it/images/fck/file/lubog.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/161368cf16833b---55628499785.pdfIn PDF document text
    • https://sharkovinkom.com/sharkovinkom.com/ckfinder/userfiles/files/94601135246.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/kmufl12d9t8er4lb81cemnfl2n/71598654446.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615323961ccca---56255095176.pdfIn PDF document text
    • http://kyochonbuenapark.iorderfoods.com/uploads/files/26211538625.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/5949546f99a7fdcd72c55f8ffcfe16ef/19470064584.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/2575e159fb95164b8a35dae0e54963c9/43256613571.pdfIn PDF document text
    • https://smilewax.tw/uploads/files/202109301350404855.pdfIn PDF document text
    • https://sts-cct.com/app/webroot/userfiles/files/52170700925.pdfIn PDF document text
    • http://studiotecnicomartani.eu/userfiles/files/20182253860.pdfIn PDF document text
    • http://saopauloairporttransfers.com/ckfinder/userfiles/files/wumavigoxuxa.pdfIn PDF document text
    • https://kuraniterbiye.com/resimler/files/54265405790.pdfIn PDF document text
    • http://lamexmarket.com/uploads/files/jageruful.pdfIn PDF document text
    • http://antopol.topmebli.com/content/xuploadimages/file/54507784652.pdfIn PDF document text
    • https://cuisinescartier.ca/upload/editor/file/rolifenafoka.pdfIn PDF document text
    • http://xn----9sbkvfu2aex3d.xn--p1ai/ckfinder/userfiles/files/25987484409.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000adef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADEF 15860 bytes
SHA-256: cb0a6d0a184b569e3f00bfc90d94960131d797bf1c6490d35f1a7902b38c1753
font_01_sfnt_off0000d68a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD68A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eea1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA1 11112 bytes
SHA-256: 262a8838d26f192e73f2088c203db454c623bc95adef979e6027beebafe83f60